This well-received Vegas-set film from Todd "Old School" Phillips doesn't stray far from the familiar lads-on-the-loose template, but it somehow made a startling $450m with a cast of virtual unknowns. With a bad case of mass amnesia, our trio of stag-do dorks have to find out how they came to be in possession, in order of discovery, a chicken, a tiger, an unknown baby, a missing tooth, a police car with an angry nude man in the boot, and a missing best mate whose imminent marriage is the reason for the hi-jinks. Some of the explanations are saved for the closing-credit still-photos sequence. I don't think they ever do explain the chicken, though: one for the sequel, maybe?